2017 Volume 55 Issue 4 Pages 419-426
Impacted supernumerary teeth can cause malalignment of the maxillary central incisors or impaired formation. However, few studies have investigated the effects of impacted supernumerary teeth on the inclination of adjacent central incisors. We performed statistical analyses of those effects using conebeam computed tomography (CBCT). For this study, 34 teeth from 34 children diagnosed with impacted supernumerary maxillary anterior teeth during the 1 year 1 month period starting from October 2013 were examined. To determine the vertical position of the impacted supernumerary tooth, a straight line connecting the crest of the maxillary alveolar bone and highest point of the inferior border of the nasal cavity floor (hereinafter, inferior border of nasal cavity floor line) was drawn. Next,we divided the length of this line by 3, and termed the upper, middle, and lower ranges as Positions 1, 2, and 3, respectively. Finally, using the nasal cavity floor inferior border line as a reference, the angle between that and the tooth axis of the affected and intact-side central incisors was termed the affected side/intact side central incisor axis inclination angle. We observed a significant difference between the affected-side and intact-side central incisor axis angles for each position. On the other hand,for the inclination angles of the central incisor axis of the affected and intact sides, there was no significant difference observed between each position expressing the vertical positions of the impacted supernumerary teeth.
